Packages in the repositories need to be made consistent:
elfutils-libelf-0.147.1.fc13.x86_64 (838 k) - @updates-testing
elfutils-libelf-devel-0.146.1.fc13.x86_64 (29 k) - fedora
won't work together.
I was trying to build gcc 4.5 from source when I ran into this. Thank you.